Transcript Understanding Our Environment

Introduction to Environmental Science
In every deliberation, we must consider our impact on the next seven generations.
- The Iroqouis Confederacy
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Yosemite National Park
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Yosemite National Park is a national park
directly east of San Francisco that was
created in 1890.
Images taken from
http://www.nps.gov
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San Francisco
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The city of San Francisco experienced a
tremendous population boom in the 19th
century due to the gold rush.
A powerful earthquake struck the city in
1906, followed by a devastating fire.
The city’s water pipes were so damaged by
the earthquake, that firefighters were not
able to tap fire hydrants.
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Earthquake of 1906
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The economic and structural damage to the city is
comparable to that of Hurricane Katrina and New
Orleans.
As part of the rebuilding process, the city applied to
the federal government to construct a reservoir in
the Hetch Hetchy valley of Yosemite National Park.
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Hetch Hetchy Valley
Image taken from
http://www.sierranevada
photos.com
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San Francisco city officials wanted to dam the Tolumne river
for a clean and dependable long-term water source for a
growing city.
An act of Congress and President Woodrow Wilson’s
approval were needed for the dam and reservoir to be
constructed.
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Environmental Science
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Environmental science is defined as the
interaction of humans with the environment.
The environment includes all conditions that
surround living organisms:
 Climate
 Air and water quality
 Soil and landforms
 Presence of other living organisms
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Environmental Science Cont’d
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Environmental science and
the issues that it studies
are complex and
interdisciplinary.
 Includes concepts and
ideas from multiple fields
of study.
 What fields are covered
by the Hetch Hetchy
debate?
Image taken from Principles of
Environmental Science,
Cunningham, 2005.
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Basic History of Humans and the Environment
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Hunter-Gatherers (10,000 B.C.)
 Obtain food by collecting plants and
hunting wild animals.
 Effects on the environment were limited.
- Hunting of some animal species.
- Picked up and spread plants/seeds to
new areas.
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Basic History of Humans and the Environment
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Agricultural Revolution (6000-7000 B.C.)
 Humans first developed the process of
breeding, growing, and harvesting plants
for food as well as animal domestication.
 Effects on the environment:
- Human population grew more quickly
- Natural habitats (grasslands, forests)
replaced by farmland and villages.
- New breeds of animals and plants were
created.
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Basic History of Humans and the Environment
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Industrial Revolution (1800s)
 Shift in the source of energy to fossil fuels
 Effects on the environment:
- More efficient farming
- Faster human population growth
- Increased burning of fossil fuels.
- Introduced synthetic plastics, fertilizers,
pesticides.
- Higher amounts of pollution.
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Spaceship Earth
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The Earth is a closed system.
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The only thing that enters or leaves the Earth in
large quantities is heat.
Resources are limited, but the population
continues to increase.
Wastes do not go away.
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Major Environmental Problems
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Resource Depletion
 Resources can be renewable (water) or
nonrenewable (petroleum).
 The supply of nonrenewable resources like
fossil fuels and minerals will eventually run
out.
 The supply of renewable resources is often
used so quickly that it cannot be
replenished.
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Major Environmental Problems
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Pollution
 Undesired change in air,
water, or soil that affects
the health of living
things.
 Biodegradable pollution
will break down naturally
over time.
 Nondegradable pollution
does not break down.
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Major Environmental Problems
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Loss of Biodiversity
 Biodiversity is the number of different
species present in an ecosystem.
 Extinction, or the complete loss of a
species, is a natural event that can be
accelerated by human actions.
The Tasmanian tiger is the only known mammal to become
extinct in the past 200 years on the island of Tasmania.
During the same period of time, on nearby Australia,
23 birds, 4 amphibians, and 27 mammal species have become
extinct.
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Environmental Ethics
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Environmental ethics is the discipline that
studies the moral relationship of human
beings to the environment.
 What is the value of the environment?
 What moral responsibility do we have?
 Which needs should be given the highest
priority in our decision making?
Different types of ethics have emerged in
human culture in modern history.
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Types of Environmental Ethics
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There are five main historical stages of
environmental ethics.
 Anthropocentric
 Pragmatic Resource Conservation
 Moral and Aesthetic Nature Preservation
 Modern Environmentalism
 Global Environmental Citizenship
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Anthropocentrism
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Anthropocentrism literally means “humancentered”.
 This set of ethics protects and promotes of
human interests or well-being at the
expense of all other factors.
 Often places an emphasis on short-term
benefits while disregarding long-term
consequences.
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Pragmatic Resource Conservation
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Advocated by President
Theodore Roosevelt.
Conservationists believe the
environment should be used
in a planned way to benefit
everyone.
The correct policy will create
the greatest good for the
greatest number, for the
longest time.
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Moral and Aesthetic Nature Preservation
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Advocated by John
Muir, first president of
the Sierra Club.
Preservationists
believe that nature
deserves to exist for its
own sake regardless
of degree of
usefulness to humans.
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The Hetch Hetchy Debate
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The Hetch Hetchy decision was the most
famous debate between the conservationist
and preservationist philosophies.
Eventually the law was passed that granted
the state of California permission to
construct a dam and reservoir in the Hetch
Hetchy valley.
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Before and After
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Modern Environmentalism
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Rachel Carson wrote a book
entitled Silent Spring about the
effects of pesticides on birds.
 Awakened the public to
threats of pollution and toxic
chemicals to humans as well
as other species.
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Global Environmentalism
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Increased travel and communication enables
people to know about daily events in places
unknown in previous generations.
 Issues and problems are explored on a
global scale instead of a local one.
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Tragedy of the Commons
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An ecologist named Garrett Hardin wrote an
essay describing the source of environmental
problems as a conflict:
 Short-term interests of individuals
versus…
Long-term interests of civilization and the
Earth itself
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Tragedy of the Commons
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Each villager owns a small
herd of sheep.
The only place for the sheep
to graze is a commons in the
center of the village.
A commons is an area that
belongs to an entire village.
 Likely outcome: Villagers
obtain as many sheep as
possible, allow to graze in
the commons.
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What if the commons was instead divided into
sections that was owned by each villager?
 Because the land is owned, individuals are much
more likely to plan and use it for the long-term.
“In the history of the world, no one has ever washed a rental car.”
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Larry Summers, Chief Economic Advisor to President Obama
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Economics and the Environment
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Supply and Demand – The
greater the demand for a
limited resource, the higher the
price.
 Examples:
- Increasing price of
oil/gasoline
- Consistently low price of
corn in U.S.
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Economics and the Environment
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Cost/Benefit Analysis – Is the cost of doing
something worth the price?
 Ex: Pollution cleanup of Waukegan Harbor
Waukegan harbor
Annual fish sampling
Dredging
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Economics and the Environment
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Risk Analysis – The probability that something will
cause injury or death.
 Ex: Nuclear power
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Bhopal and Dow Chemical
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In December of 1984, a pesticide factory
located near the town of Bhopal, India leaked
a large amount of toxic chemicals into the air.
The chemicals resulted in an immediate
death toll of about 3,000 people, with 8,000
more dying of long-term health ailments.
 A total of 558,125 injuries were reported to
the Indian government.
 No legal settlement was reached with
Union Carbide, now owned by Dow
Chemical.
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Ethics and Economics
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To properly compensate and treat all
individuals affected by this disaster, Dow
Chemical would have to pay several billion
dollars in settlements.
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Dow Chemical has a yearly profit of over $2
billion, with total assets worth nearly $70
billion.
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The Demographic Divide:
Developed and Developing Nations
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Developed and Developing Countries
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Environmental issues faced by different
countries varies depending on their
economic status.
Developed – Higher incomes, longer life
span, lower growth rate.
 Ex: United States, Japan, France, U.K.
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Developing and Developed Countries
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Developing – Have lower
incomes, shorter life span,
rapid population growth.
 Ex: India, Afghanistan,
most of sub-Saharan
Africa
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Population and Consumption
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Developing countries tend to have severe
overpopulation. This leads to:
 Deforestation
 Bare soil
 Native animals driven to extinction
 Malnutrition, starvation, disease
About 80% of the world’s population falls in
this category
 Only use 25% of the world’s resources
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Developing and Developed Countries
Source: Holt Environmental Science, Arms, 2007
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Population and Consumption
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Developed countries, while smaller in size
and growth, consume resources at a greater
rate.
About 20% of the world’s population uses
75% of its resources.
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Developing Countries
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Many products used
in developed
countries are
produced in
developing
countries.
Foxconn, a computer
chip company,
experienced a rash
of suicides at its
China factory.
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Example
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StarKist brand chunk light tuna in
water
 Price at Jewel-Osco grocery:
$0.99
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American Tuna brand wild
albacore tuna in water
 Price at Whole Foods market:
$4.99
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Ecological Footprint
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An ecological footprint is one
measurement of a person’s
resource use.
 Includes the amount of
space needed to support
each person in a nation,
including forests, farms,
cities, etc.
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The Goal: A Sustainable World
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Sustainability
 Human needs are met so that the
population can survive
indefinitely.
 “Meeting the needs of the
present without
compromising the ability of
future generations to meet
their own needs.”
- Brundtland Commission, 1987
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